I don't know about Carbonite, but if you look at the suggestions thread just above, I link to GatherMate2_Data, which has all the nodes. You will need GatherMate2, and the import instructions are on the _Data page.

Since I haven't tried it, either it will display in the Carbonite map, or you will have to flip to the Blizzard map now and then.

To be honest Dark Soil can practically spawn anywhere in the valley and not to mention, thousands of spawn points around all the other zones, I don't know if it's any help to track all possible spawns at once, just look at: http://www.wowhead.com/object=210565 Not that helpful, gives you an idea where to look (like an area) but nothing specific other than that, hehe. :P